I have a similar setup on my frag tanks. yes, you can grow anything in there! I have had great SPS growth. The only think with T5s is that is seems easy to bleach things. when i first put SPS under T5s I bleached every piece - months later the color came back. in my 72 SPS liked to be about 10-14" below the light - in my new tank I have SPS ranging from 8.5 to 17" from the light (running ATI Blue", Geissman 15K, KZ Fiji)
When the bulbs become of age consider replacing them with ATI , Geissman or UVL bulbs.